Automatic frequency regulator



April 1943- w. A. CHARBONNEAUX AUTOMATIC FREQUENCY REGULATOR Filed Sept. 6, 1941 4 SheetsSheet 1 WILSON A. CHARBONNEAUX w. A. CHARBONNEAUX 2,316,561 AUTOMATIC FREQUENCY REGULATOR April 13, 1943.

4 Sheets-Sheet 2 Filed Sept. 6, 1941 INVENIOR. /0/ BY u.son A.CHARBONNEAUX I4TTQM) April 1943. w. A. CHARBONNEAUX 2,316,551

AUTOMATIC FREQUENCY REGULATOR Filed Sept, 6, 1941 4 Sheets- Sheet 3 INVENTOR. W! LSON A. CHARBONN EAUX April 1943. w. A. CHARBONNEAUX 2,315,551

AUTOMATIC FREQUENCY REGULATOR Filed Sept. 6. 1941 4 SheetsSheet 4 FIG.8.

INV ENT OR.

W1 LSON A. CHARBONNEAUX BY Patentd Apr. 13, 1943 UNITED STATES PATENT OFFICE AUTOMAIIC FREQUNY REGULATOR Wilson A. Charbonneaux, Burlirigton, Iowa Application September 6, 1941, Serial No. 409,804 14 Ciaims. (01. 171-119) This invention relates generally to automatic frequency regulators and, more particulariy, to certain new and seful improvements in automatic frequency regulators especially adapted for use with alternating current generators.

My invention has for its primary objects the provision of an automatic frequency regulator of the type stated which is compact and rugged in construction, which may be simply and quickly installed as a unit, which is highly sensitive to irequency variations of the alternator over which it establishes cntrol, which is Uniquely constructed for sensing or detecting the magnitude of frequency departure of an alternator to which it is connected and integrating such frequency departure to efiect chronometric mer-compensatien or time make-up, as it may be called. so that the controlled generator wi11 maintain an average frequency which conforms, Within very narrow limits, to a selected frequency, which responds very quickly to any variation in generator frequency and operates to maintain a relatively precise degree of uniformity in the frequency of the generator output, which has no tendency to produce hunting or cycling of the control imposed upon the generator, and which is highly eflicient in the performance of its stated functions.

And With the above and other obJects in view, my invention resides in the novel features of form, construction, arrangement, and combina- 'ticn of parts presently described and pointed out in the claims.

In the accompanying drawings (four sheets) Figure 1 is a reduced perspective view of an automatic frequency regulator cnstructed in accordance with and embodying my invention, the housing being partially broken away for disclosing the various operating parts of the apparatus;

Figure 2 illustrates the reeulatcr partly in side elevation and partly in section along the line 22, Figure 3, the housing being omitted;

Figure 3 illustrates the regulatcr partiy in front e1evati0n and partly in section along the line 3-3, Figure 2, the housing being omitted;

Figures 4, 5, 6, and 7 are fragmentar'y transverse sectional views of the regulator taken approximately along the fines 4-4, 5-5, 68, and ii, respectively, Figure 3, and depicting in en larged detail various specific elements of the apparatus; and

Figure 8 is a wiring diagram schematically illustrating the manner in which the regulator and its several component elements are c0nnected for efiecting control of an aItematr.

Referring now in more detail and by reference characters to the draWings, which illustrate a preferred embodiment of my invention, the automatic frequency regulator, generaily designated A, comprises a housing or cabinet I constructed preferably of sheet metal and of rectilinear form and including front and rear walls 2, 3, respectively, opposite side walls I, and top and bottom walls 5, 6, respectively, the front wall 2 having an opening for accommodating a hinged, glasspaneled door d. Mounted preferably, though not necessarily, upon the front wall 2 of the housing i below the door d, 15 a horizontally disposed terminal-biock 1 constructed of any suitable dialectric material and provided with three pairs of terminal posts 8, 9, and 10 and one set of three terminal posts, the latter including two end-posts i I. and an intermediate post 1 l.

Mounted within the housing or cabinet I and supported upon the bottom wall 6 by means of conventional L-shaped-btackets I2, is a verticaily disposed frame l3 of more or less rectilinear shape, but having a somewhat irregular contour for conveniently supmrting the several moving parts of the apparatus inproper relative position for mechanicafly eflflcient co-action with each other while, at the same time, achieving compactness et design. 4

Mounted at the lower end and upon the rear face of the frame 18, is a lamination-stack Il provided with a potential coil I5. Mounted also Within the lamination stack i4 in downwardly spaced relation to the potential coil 15, is a current c011 i8. At its lower end, the frame [3 is preferably integrafly formed With a forwardly extending bracket H, and bolted or otherwise secured upon, and upstanding from the forward end of, the bracket i1, is a conventional magnat-assembly 18 having a relatively narrow air-gap i9.

Formed preferahly integraily with, and projecting upwardly from the upper face of, the frame l3, is an auxiliary bracket 20 provided along its one side face with a fiat upstanding face-plate 2! for receiving and supporting a suitable electrio muter 22 having a drive-shaft 23 extending horizontafly through the face-plate H and provided on its extended end with an eccentric wheel or cam 24. 4

Along its forwardly presented face, the bracket 20 is provided With a. forwardly projecting horizontally disposed headplate 25, and at its upper end in lateraily spaced relation to the face-plate 21. the bracket 20 is provided with a. pair of suitably spaced rearwardly projecting apertured cars therefrom in spaced 2 26 for supporting a horizontally disposed pivotpin 21.

A1so fixed upon and extending horizontally across the upper face of the frame 13 in downwardly spaced relation to the head-plate 25, is a top-plate 28.

Journaled at its ends in, and extending vertically between, bearings suitably formed in the head-plate 25 and the bracket H and extending freely through the top-plate 28, is a spindle 29 provided adjacent its lower end with a torquedisk 3!) disposed in a horizontal plane and projecting peripherally through the air-gap 19 of the magnet-assembly l8 and between the potential coil 15 and current coil [6 in the formation of an induction motor of the watthour mater type. which is provided with the usual full-load adlustment screw 3l, lightload adjustment screw 32, and current coil adjustment member 33.

Adjacent its upper end and in the space between the head-plate 25 and the top-plate 28, the spindle 29 is provided with a coller 34 having a substantially rigid forwardly projcting radial arm 35. Beneath the collar 34, the spindle 29 is provided with a spirally wound hair-spring 36 secured at its outer or free end to the upper extremity of an L-shaped bracket 31 mounted upon the upper face of a compensator arm 3-8, in

turn, rockably mounted upon the spindl 29 and A supported in upwardly spaced relation to the topplate 28 by means of a depending shoulder 39.

Swingably mounted upon the pivot-pin 21 by means of a depending offset lus or car 48, is a rocking arm 4l provided on its upper face with an upstanding shoulder 42. Bolted or otherwise suitably secured upon the upper face of the shoulder 42 and extending horizontally forwardly relation over the upper face of the arm 4 l is a resilient leaf member 43, riveted upon.the upper face of which is an L-shaped bracket 44 having a somewhat triangularly shaped vertical les 45 provided at its upper end with a camfollowing relier 46. Threaded in the bracket 44 and extending through the leaf-member 43 for endwise impinging upon the upper face of the bracket arm 41, is an adjustment screw 41 conventionalls provided with a look-nul; 48.

Formed preferably integrally with, and extending laterally outwardly and downwardly from the forward end of, the arm 4l, 13 a yoke 49 preferabl of inverted U-shape and accordingly having a pair of spaced parallel depending legs 58 4 18 and journaled at its ends in each provided at its lower extremity with a transversely extending rockable contact-lever 5l. At their inner or adjacent ends, the contact-levers 5l terminate approximately midway between the legs 50 and are spaced by a distance slightly greater than the width of the adjustment arm 35, the levers 51 at such opposed ends being provided with downwardly presented obliquely diverging abutment-faces 52.

At their opposite or outer ends, the contactlevers 51 are provided along their upper margins with inwardly turned flanges 53, and bolted or otherwise suitably secured to, and depending from, the flanges 53, are ball-ended abutment plugs 54 positioned for endwise abuttin engagement with the free ends of horizontafly disposed leafspring members 55 arcuately bent at their other end in the formation of a loop 56 secured,

as at 51, upon the under face of th head-plate 25 and provided with a tension-adjusting screw .Bolted or otherwise suitably secured upon the upper face of the head-plate 25 adjacent the opposite ends thereoi, are simple make-and-break switches 59 preferably having conventional spring-pressed plungers 66 extending downwardly therefrom for endwise abutting engagement with the leaf-springs 55, as best seen in Figure 3.

Secured upon the front fac of the frame I3 by means of flllister-headed screws 6 l, are spaced horizontally disposed trame-bars 62, and welded or otherwise fixed along their rear margln to the forwardly presented faces of, and projecting forwardly in laterally spaced parallel relation from. the bars 62, are three thin stee1 plates 63. 84, 6.5, rigidly secured to each other adjacent their forward marglns by spacer bolts 86.

Extending horizontally through the plate 64, is a tubular bearing or sleeve 61 provided adjacent one end with a diametrally enlarged annuler shoulder 68 and extemally threaded, as at 69, for receiving a look-nui: 16 adapted to draw the shoulder 68 tightly against the plate 64 for rigidly securing the bearing-member 61 in place.

At its other end, the sleeve 61 is provided with a rotatable quill 1l abuttingly ensaged at its one end against the shoulder 68 and extending with the sleeve 61, through the plate 63, the quili 1l being Joumaled in the plate 63 and held against longitudinal translation along the sleeve 61 by a set-collar 12, as best seen in Figure 3.

Keyed upon the quill 1l between the plates 63, 64, is a gear 13, and similarly keyed upon the qulll 1l adjacent the coller 12, is a cam-disk 14 having a spiral-shaped peripheral surface or track 15 extending around the entire circumference thereof and having its terminal ends connected by a narrow radially projecting stop lug 16, all as best seen in Figure 4.

Bolted or otherwise suitably secured upon the outwardly presented face of the plate 65, is a synchronous electric motor 11 having a driveshaft 18 projecting freely through the plate 65 and journaled within the sleeve 61. Pinned upon the shaft 18 for rotary movement between the plates 64, 65, is a. drive gear 19 having m'eshing engagement with an intermediate gear 86, in turn, pinned upon a horizontaliy disposed jackshaft 8l spaced upwardly from the motor shaft the plates 63, 65, the shaft 8l extending freely through a relatively large aperture, as at 82, in the intermediate plate 64.

Pinned upon the the plates 63, 64, is a clutch-disk 83 suitably faced with a friction disk 84, and shiftably keyed to the jack-shaft 8l for rotation therewith, is an auxiliary clutch disk 85 also faced with a friction dis]; 86 and normally urged toward the disk 85 by means of a comp ession spring 81 coiled on the jack-shaft 81 and disposed freely through the aperture 82 for .impingement at its opposite ends against the outer face of the clutch disk 85 and the intermediate gear 86. Frictionally held between the clutch disks 83, 85, and loosely mounted for free rotation upon the jack-shaft al, 15 a gear 88 having meshing engagement with the quill-gear 13.

The gear 13 also meshes with a pinion 89, which is part of a clock-work gear train including spindles 98, si, 92, Journaled between the plates 63. 64, and pinions 93, 94, 95, and 96 of suitable selected ratios for transmitting the rotary movement of the gear 13 to the spindle 92. Keyed upon the spindle 92, is a topthed or ratchet wheel .91, and swingably mounted upon an auxiliary spindle 98 suitablysupported upon the plates 63, 64, is a pawl 99 provided at its upper end with a jack-shaft 8l intermediate parallel cars I05.

detent 109 for engagement with the teeth of the ratchet wheel 91. As best seen in Figure 2, the pawl 99 is elongated to extend downwardly beyond the spindle 98 and at its iower end is provided with a disk-shaped magnetic pole-piece Il msitioned in close proximity to the pole-1ace l02 of an electro-magnet or solenoid 193 suitably secured upon the lower end of the plate 53, the pawl 99 being biased outwardly by means of a hair-spring or the like Il, so that the pole-piece loi is normaily urged outwardly away from the pole face Il)! of the solenoid l3.

The motor shaft 19 is likewise elongated to project outwardly beyond the tubular bearing 31,

and pinned upon the proJecting end thereof, is a diametra1ly extending cross-arm Il provided at one end with an obliquely offset pair of spaced Ill6 designates an L-shaped rock-arm having a horizontal leg Il" swingably A secured between the ears 105 and provided with an axially extending round-headed pintle 109 for rotatably supporting a crowned roller or cam follower I119 adapted for engagement with the peripherai track 15 of the cam il. The other or tr9.nsverse leg HO of lever [98 extends pref erably, though not necessarily, at 90 to the leg In! and has its longitudinal axis disposed in a plane which is diametrai with respect to the motor shaft 18 and cam M.

Mounted for universal movement in, and projecting outwardiy from, the laver-arm I "J, is a bail-ended fltting HI having its center oi rotation precisely aligned with the longitudinal axis of the motor shatt 18, and threaded at one end into the fltting HI, is a link H2 provided at its other end with a second bail-ended fitting 3, in turn, mounted for universal rotation in the outer end of a rearwardly extending arm ll4 keyed at its rear end upon a verticaily disposed rock-sha1t H5 Jpurnaied at its ends in, and extending between, the frame bars 62 and conventionally held against vertical translation by means of suitable set collars 6.

At its upper end, the rock-shaft H5 projects through a frame bar 62 and is provided Wlth a horizontal auxiliary rock-arm l 11 having a rearwardly extending projection '1' and for receiving one end of a tension spring .9, which is secured at its other end to an upstanding pin 28' flxed in the upper face of the top-plate 28 for biasing the cam-iollowing roller HI! against the cam-track 15 and taking up al] accumulated wear and lost motion. H9 designates a link which extends lengthwise between, and has downwardly bent end-portions or legs H9, 429, pivotally projecting throug the arms H! and 38, respectively, the link H8 being secured in place by small set collars l2i, i22, ail as best seen in Figures 3 and 6.

The potentiai coil I5 at one end is connected electrically to one of the terminal posts 8 and, similarly, the current coil 16 at one end is connected electrically to the other terminal post 9. The potentia1coil 15 and current coil I 5 at their other end are, respectively, connected electrically in common with the two leads from the synchronous motor 11 to the two terminal posts 9, and the cam driving motor 22 is likewise connected electricaily across the terminal posts in. Each of the switches 59 at one terminal is connected electrically by a common lead to the intermediate terminal post 1 I and the other two terminals of A the switches 59 are separately connected electricaHy to the two terminal posts II. The soleapertured at its noid l03 is connected electricaily to the terminal posts l2.

By reference to the wiring diagram, Figure 8, it will be seen that the frequency regulator A is preferably connected through a conventional stop-down transformer t to the output conductors or bus bars B 01' an alternatlng current generator G driven by a prime mover P having a governor control or speed-regulating motor M. The terminal posts 8 are connected electrically to the secondary of the transformer t and to a resonant filter circuit 1. The terminal posts M and the terminal post Il are connected electrically to an auxiliary v. A. C. line oi bus B. The terminal posts l 1 are connected electricaily to a reversing contactor R, in turn, connected electricaily across the bus B and to one side of a govemor motor supply bus B and to the reversing field of the govemor supply motor M, in turn, connected electricaily to the other side of the govemor motor supply bus B". Finaily, the terminal posts I2 are connected electricaily to a conventional pendulum-actuated relay p which forms a part of the master clock C.

In use and operation, the resonant filter circuit 1 is so constructed with condensers and coils of appropria relative values as to transmit a positive or negative impulse through the potential coil 15 and current coil 15 which is directiy proportional to the difl'erence between the frequency of the generator output current and some selected or established frequency. For example, if the resonant filter 1 is set up for an assigned frequency of 60 cycles, the disk 30 and its associated spindle 29 will remain stationary with the indicator arm 38 held in its central or so-called neutra1 position. When the frequency of the line current departs from the established frequen0y, the resonant filter circuit 2 will transmit a small electrical impulse which is directly proportional to the deviation and is positive or negative, depending upon whether or not the frequenc of the line current is above or below the established frequency, thereby causing the disk 39 and its associated spindle 29 to rotate t0 a degree directly proportional to the magnitude of the frequency deviation and either in a clockwise or counter-clockwise direction, depending upon the positive or negative character of such frequency deviation.

Meanwhile the cam driving motor 22 is in constant operation, and the attendant rotation 01? the cam 24 continuously rocks the arm Il and its associated yoke 49, causing the switch arms 5! to move up and down past the radial arm 35. As long as the spindle 29 is stationary and the arm 35 is in neutral position, as shown in full lines in Figure 7, the arm 35 will be aligned with the gap or space between the opposed ends of the switch arms 5! and the latter will pass freely by the arm 35 during the course of their up and down movement. When, however, the disk 30 and the associated spindle 29 are rotated under the influence of current transmitted through the resonant filter I, the arm 35 will swing into the path of pne or the other of the switch arms 51 for engagement with the oblique abutment face 52 thereof, oausing the respective arm 51 to swing upwardiy to bring the abutment pin 54 into engagement With the free end of the leafspring 55 for actuating the particular switch plunger 60 to complete the circuit through the reversing contacter R to the governor motor M 01 the prime mover P for speeding up or slowing down the prime mover P in direct response to the magni- For example, where the deviation is relatively .great, the arm 35 will be swung through a relatively great arc and will engage an arm 5! .at a lower point along the oblique abutment face 52 thereoi, so that such arm 5l will remain depressed and the asscciated switch 59 will remain closed for a correspondingly longer portion of the up and down cycle et the yoke 49. It will thus be avident that the frequency-corrective impulse transmitted to the motor M will with variations in the magnitude of the frequency deviation even though it is intermittent and, therefore, achieves an anti-hunting efiect.

Meanwhile the synchronous motor 17 is rotating and through the shaft E8 continuously driving the gear M and the cam follower bracket fi. By reason of the universal connection ber tween the tting Hi and the arm lit, such rotary movement of the bracket i is not transmitted to the link H2. on the other hand, the rotary movement of gear l9 is transmitted through the gear 8@ and the clutch members S33, 85, to the gear 88, which, in turn, meshes with the quill gear l3 and produces rotation of the quill H and its associated cam l6.

If the alternator G is to be controlled or regulated to maintain an assigned frequency of sixty cycles, the gear l may preferably have one lmndred four teeth; the gear 89 accordingly has ten teeth, and the gear 83' likewise has ten teeth meshing with the quill gear l3, which has une hundred teeth. Normally the cam M is set in relation to the arm tilt, so that the cam follower 169 will engage the cam surface 15 at the midpoint of its peripheral length or so-called neutral position, as shown in Figure 4. Consequently the quill l! will rotate slightly faster than the shaft 18 and the cam H will rotate angflarly with relation to the arm l6, shiftirig the cam follower 109 and imposing bias upon the hair-spring 36 in such a direction as will cause the generator G t0 gain.

The qu;ill gear 13, however, is also in meshing engagement with the pinion 89 of the clockwork train and consequently produces rotation of the ratchet wheel 81. The ratio of the gears 89, 93, 94, 95, and 98 is such that the ratchet wheel W will operate at 5.2 R. P. M. The ratchet wheel 91 is, further, provided wlth six equally spaced teeth, so that 31.2 teeth will pass any given point adjacent the periphery of the ratchet wheel al in one minute. Thus it will be seen that a tooth of the ratchet wheel 91 will .pass such given point once every 1.9 seconds. The clock pendulum meanwhile swings or oscillas at the rate of thirty beats or oscillations per minute, thus breaking the solenoid circuit thirty times par minute and lifting the pawl arm 99 periodically at intervals of two seconds. Consequently, if the frequency of the current output of the alternator G'is exactly correct, the pawl 99 will hold the ratchet wheel 91 for a period of .1 second during each two second interval.

When the ratchet wheel 91 is held stationary, the rotary movement of the gears 89, 93. 96. 95,

vary in magnitude and 93 will be suspended and the quill H and its asaociated quill gear will also be heldagainst rotation, causing the gear 88 to slip between the clutch friction dises 8l, 88. The retardation of the quill Il will obviously produce 9. relative rotary movement between the "cam 14 and the bracket arm Il opposite to that normally produced by the relative difference in speed between the quill H and shaft 18, so that the cam follower l09 will slide back over the cam suniace l5, imposing an opposite or control-compensating bias on the hair-spring 36, causing the generator G to decelerate or lose by an amount equal to the amount previously gained, so that-the average efiect during the increment of time in zero. This time make-up or chronometric mer-compensation will be precisely and accurately effective as long as the 10s in frequency does not exceed 4% of the assigned frequency. Obviously, if 'the deviation does mcceed such 4% limit, a serious time-error has been committed which the resulator itself cannot make up and is of such character as may require shut-down and repair. The gear ratios and other values in the above example may, of course, be varied to achieve a greater or lesser percentage sensitivity in the apparatus.

It will, of course, ne evident that the automatic regulator of my present invention will thus operate to maintain a very precise anti-hunting frequency control and, at the same time, will synchronize the frequency of the output current of the alternator with a master clock and cause the control to operate upon the governor motor to make up or compensate for any lest frequency. This latter unique feature is particularly important in view of the widespread use of sixty cycle alternating current for operating timing devices, both of the household as well as the'industrial type. Especially with reference to the use of alternating current as a motive power for timing devices, it is not only essential that the frequency be maintained constant and quickly corrected to eliminate an deviation from the established frequency, but also it is exceedingly important that any acceleration or deceleration of the timing devices powered by such alternating current :be compensated for. For example, if the movement of an electric clock is accelerated as a result of an increase in the frequency of the current by which it is driven, the clock will tend to run fast. Even though the frequency of the motive current is corrected and brought back to normal, the increment of time which has been gainer! by the clock will not be corrected. The clockwill still be fastbywhatever increment of time has been gained during the interval in which the frequency of the line current was excessive. My present contre] apparatus uniquely senses or determines the amount of frequency deviation, integrating the same in terms of time and modifying the control eiect of the regulator in terms of this integrated characteristic, so that the generator thus controlled will not only be restored to normal frequency, but will actually be caused to deviate from the normal frequency in the opposite direction of its initial A deviation for a suficient period of time, so that the amount of lest frequency will be made up.

It will be evident that my automatic frequency regulatbr is relatively simple, rugged, and durable in construction and is extremely accurate and precise in operation, uniquely providing a type of time make-up or chronometric compensating control. Although the regulator may preferably be used for establishing frequency regalating control over an alternator, it W111, et course, be understood that this automatic resulating device in its entirety or component parts thereof may be employed for variousreguiatory and control purposes, and it should further be understood that changes and modifications in the form, construction, arrangement, and combination of the severai parts of the mechanism may be made and substituted for those herein shown and described without departing from the nature and principle of my invention. Having thus descbed my invention, what I claim and desire to secure by Letters Patent is:

1. A ireqency regulator for an alternator having speed-goveming means comprising flrst means mechanicaily actuable responsive to ourrent proportional to the deviation of the frequency 01 the aItemator output from an assigned irequency for producing frequency-corrective movement of the speed-goverxflng means, accumulating cam means for intergrating the diflerence between the frequency of the alternator output and the assigned frequency with respect to time, and means actuable by the integrating means for imposing a time-compensating bias upon the mechanlcaily actuable means and thereby modifying the frequency-corrective movement of the speed-goveming means.

2. In a frequency regulator for an alternator having a speed-govemor, a resonant fllter circuit for transmitting a current having a voltage proportional to the frequency departure of the v alternator, a motor of the watt-hour meter type driven by the current transmitted by the filter circuit, au arm actuated by the motor for effecting frequencycorrective movement of the speed-govemor, spring means for normally holding the arm in a neutrai position, and means for integrating the frequency deviation with respect to time and accordingly modifying the effect of the spring means.

3. In a frequency regulator for an alternator having a speed-governor, a resonant filter circuit for transmitting a current having a voltage proportional to the frequency departure of the alternator, a motor ofithe watt-hour mater type driven by the current transmitted by the filter circuit, a swingable ann mechanica1ly actuated by the motor, means connected to the speedgovernor for producing frequency-corrective movement thereof responsive to oscillation of the arm, a synchronous motor driven from the a1ternator output, a ratchet connected through friction driving means to the synchronous motor and through connecting means to the arm, and means controlled by a clock for arresting movement of the ratchet for a predetermined interval when the frequency of the alternator output is normal and increasing or decreasing such intervai of arrested movement in proportion to the integrai of the frequency deviation with respect to time.

4. In an alternator frequency regulating mechanism having a movable control arm, a synchronous motor driven from the alternator output, a primary driven member connected directly to the motor, a secondary driven member indirectly connected to the motor through slip-permitting means at a rate substantialiy faster than the primary member to produce angular departurc between the movement of the primary and secondary members, time-controlled means for periodically retarding the secondary member to compensate for such departure so that over a given interva] the average departure will be zero,

and means actuable responsive to said departure for modifying the movement of the control arm.

5. In an alternator frequency regulating mech anism having alternator speedcontrolling means, a synchronous motor driven from the alternator output, a primary driven member connected directly to the motor, a secondary driven member indirectly connected to the motor through slip-permitting means at a rate sub stantiaily faster than the primary member to produce angular departure between the movement of the primary and secondary m'embers, time-controlled means for periodicaily retarding the secondary member to compensate for such departure so that over a given interva] the average departure will be zero, and means actuable responsive to said departure for producing a corresponding speed-modifying effect upon the speed-controlling means.

6. In an a1temator frequeney regulating mechanism having a movable contre] arm, a spring for biasing said control arm, a synchronous motor driven from the alternator output, a primary driven member connected directly to the motor, 9. secondary driven member connected indirectly to the motor through slip-permitting means, said secondary member being norma1ly driven faster than the primary member, means for producing a mechanica] efiect directly proportiona] to the diflerence in speed between the primary and secondary members, means for intermittently retarding the secondary member to,

render the increment of speed gain between the secondary and primary members periodio and non-cumulative, and means for transmitting said mechanicai eiect to the spring to modify the biasing eiect thereoi.

7. In an aitemator frequency regulating mech- .anism having a spring-biased central arm, a synchronous motor driven from the aItemator output, said motor having a drive shaft provided k with a diametral cros trame, a quill rotatably mounted on the shaft and provided with a cam, a driving gear also mounted on the shaft, a driven gear mounted on the quill, friction-clutch means drivingly connecting said gears, a cam-follower rockably carried by the cross frame and bearing on the cam for movement responsive to relative angular movement between the cam and frame, olock-controlled means for modifl7ing the movement of the quill, and means connecting the camiollower and the control arm biasing spring for modifying the biasins eflect of the spring responsive to relative angular movement between the cam and cross trame.

8: In an alternator frequency regulating mechanism having a spring-biased control arm, a synchronous motor driven from the alternator output, said motor having a drive shaft provided with a diametral cross trame, a quill rotatably mouned on the shaft and provided with a cam, a driving gear also mounted on the shait, a driven gear mounted on the quill, friction-clutch means drivingly connecting said gears, said driving gear and driven gear having a ratio to each other such that the quill and its associated cam are rotated more rapidly than the cross frame to produce a relative an3ular movement between the cam and cross trame, a cam-follower rockably carried by the cross frame and bearing on the cam for movement responsive to relative angular movement between the cam and trame, dock-controlled means for retarding the quill to compensate for said relative angular movement in such a manner that the average angular movement overa given interval is zero, and means connecting the cam-follower and the control arm biasing spring for modifying the biasing eflect of the spring rcsponsive to relative angular movement between the cam and cross trame.

9. In a frequency regulator for an altemator having a speed-govemor, a reSonant filter circuit for transmitfing a 'current having a voltage proportional to the frequency departure of the alternator, a motor oi! the watt-hou meter type driven hy the current transmitted to the filter circuit, an arm normally disposed in a neutral position ctuated 'by said moto! for efiecting irequency- .nator, a motor of the watt-heur mater type -driven by the current transmitted by the filter circuit, au arm actuated by the motor for efiecting frequency-corrective movement of the speed-governor, means fornormally holding the arm in a neutral position, and meens for in tegrating the frequency deviation with respect to time and accordingly modiiying the effect of the said previously mentioned means.

11. In a frequency regulator for an alternator having a speed-govemor, a resonent lter circuit for transmitting a current having a voltage proportionai to the frequency deperture of the alternator, a motor oi the watt-hour meter type driven by the current transmitted by the filter circuit, en arm for efiecting frequency-corrective movement of the speed-govemor, means for normally holding the arm in a neutre] position, and accumuleting cam means integrating the frequency deviation with respect to time and accordingly modifying the eflect of the means hormaliy holdme the arm in neutral position.

12. In a irequency regulator for an alternator, a driving motor, a resonant filter circuit for transmitting a current having a. voltage proportional to the irequency departureof the alternator, a motor 0! the watt-heur mater type driven by the current transmitted by the flltercircuit. an arm actuated by said-motor, control swltches for the aJtemator drlving motor, means io r normally holding the erm in a nutral position, and means cooperating with said switch means accomplisbing intermittent contra] implses to the driving motor of the alternator.

13. In a frequency regulator for an alternator.

a driving motor, a resonant filter circuit for transmittlng a current having a. voltage proportional to the frequency departure of the alternator, a motor of the watt-hou meter type driven by the current transmitted by the filter circuit, au ann actuated by said motor, control switches for the eltemator driving motor, means for normally holding the arm in a neutral position, means cooperating with said switch means acnomplishing intermittent control impulses to the driving motor of the alternator, and means for varying the duration of the current supply impulsee.

143. In a frequency regulator for an alternator, a driving motor, a resonant filter circuit for transmitting a current having a voltage proportional to the frequency departure of the alternator, a motel of the watt-hour mater type driven by the current transmitted by the filter circuit, en mm actuated by said motor, control swltches for the ultemator d1iving motor, means for normally holding the arm in a neutral position, means coopexating with said switch means accomplishing intermittent control impulses to the driving motor of the alternateur, means for varying the duration of the current supply impulses, and menns for integrating the frequency devieton with respect to time.

WILSON A. CHARBONNEUX. 

